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Forked from OpenSource / Ardupilot
14191 commits behind, 2243 commits ahead of the upstream repository.
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Andrew Tridgell authored
on the APM2 we usually use none of the ADC channels, although we may
use the airspeed sensor. This change means we detect which channels
are being read, and only do the SPI transfers for those ones. That
saves us about 100usec per timer interrupt (ie. about 10% of our CPU)
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